EP 3178084 A1 20170614 - ACTIVE REDUCTION OF HARMONIC NOISE FROM MULTIPLE NOISE SOURCES
Title (en)
ACTIVE REDUCTION OF HARMONIC NOISE FROM MULTIPLE NOISE SOURCES
Title (de)
AKTIVE MINDERUNG VON HARMONISCHEN RAUSCHEN AUS MEHREREN GERÄUSCHQUELLEN
Title (fr)
RÉDUCTION ACTIVE DE BRUIT HARMONIQUE EN PROVENANCE DE MULTIPLES SOURCES DE BRUIT
Publication
Application
Priority
- US 201414494852 A 20140924
- US 2015045823 W 20150819
Abstract (en)
[origin: WO2016048489A1] A system and method for reducing harmonic noise caused by two or more noise sources by causing one or more loudspeakers to produce sounds that are at about the same frequencies as the noise and of substantially opposite phase. There is a noise canceller associated with each noise source. Each noise canceller includes a harmonic sine wave generator that generates an output sine wave. Each noise canceller also has an adaptive filter that uses a sine wave to create a noise reduction signal that is used to drive one or more transducers with their outputs directed to reduce noise caused by the noise sources. There is an overlap detector that compares the harmonic frequencies and, based on their proximity, alters the operation of one or more adaptive filters.
IPC 8 full level
G10K 11/178 (2006.01)
CPC (source: EP US)
G10K 11/17823 (2017.12 - EP US); G10K 11/17835 (2017.12 - EP US); G10K 11/17854 (2017.12 - EP US); G10K 11/17883 (2017.12 - EP US); G10K 2210/1282 (2013.01 - EP); G10K 2210/3026 (2013.01 - EP); G10K 2210/3027 (2013.01 - EP); G10K 2210/3028 (2013.01 - EP); G10K 2210/3033 (2013.01 - EP); G10K 2210/3054 (2013.01 - EP)
Citation (search report)
See references of WO 2016048489A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
WO 2016048489 A1 20160331; CN 106716522 A 20170524; CN 106716522 B 20210205; EP 3178084 A1 20170614; EP 3178084 B1 20181003; JP 2017537335 A 20171214; JP 6499279 B2 20190410
DOCDB simple family (application)
US 2015045823 W 20150819; CN 201580051562 A 20150819; EP 15763674 A 20150819; JP 2017515715 A 20150819